how many cc's??? 4mm long rod

[1promodfan]

I have a '89 250R with a 4mm long rod (hot rods) crankshaft with a '86 piston bored .100 over.......68.50mm piston. Just trying to figure out how many cc's I have. Any help is appreciated.

[methyman]

Click this link and it has a calculator on it for engine displacement. It is 280cc.

http://www.everything2stroke.com/resource/displace.php

[1promodfan]

So I guess the stroke on a stock 250R is 72mm? Then with a 4mm rod makes it a 76mm stroke. Thanks for the help!!